IBook shuts off without warning

Hi,
How do I solve this? My iBook's started powering off without warning -- even if the battery's fully charged. I left it on charge overnight and only got ten minutes use out of it before the iBook switched itself off.
What do I do?
iBook G4 12   Mac OS X (10.3.9)  
iBook G4 12    

HI Oliver,
You may want to try reseting the PMU (Knowledge Base Document #14449, which covers Resetting Powerbook and iBook Power Management Unit (PMU)). Have you looked at Knowledge Base Document #300552 on My computer won't turn on (Display troubleshooting) and Knowledge Base Document #106214 on Troubleshooting Startup Issues.
Jon
Mac Mini 1.42Ghz, iPod (All), Airport (Graphite & Express), G4 1.33Ghz iBook, G4 iMac 1Ghz, G3 500Mhz, iBook iMac 233Mhz, eMate, Power Mac 5400 LC, PowerBook 540c, Macintosh 128K, Apple //e, Apple //, and some more...  Mac OS X (10.4.5) Moto Razr, iLife '06, SmartDisk 160Gb, Apple BT Mouse, Sight..

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